ML19209A106

LER 79-044/03L-0:on 790913,water Leak Discovered Coming from Cracked Weld on Reactor Coolant Charging Pump Discharge Relief Valve Flange.Caused by Pinhole Crack in heat-affected Zone of Socket Weld.Valve Replaced

ML19209A106
Person / Time
Site:	Calvert Cliffs
Issue date:	09/27/1979
From:	Legiewski J, Miernicki M BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19209A104	List: ML19209A103 ML19209A106
References
LER-79-044-03L, LER-79-44-3L, NUDOCS 7910020368
Download: ML19209A106 (1)

Text

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[1 DATE 14 RE, ORT DATE 80 EVENT OESCRIPTION AND PROB A8LE CONSEQUENCES h o 2 1During normal operation the plant operator discovered a water leak from a I o 3 l cracked weld on 12 reactor coolant charging pump discharge relief valve flange. l o . lThe pump was incediately removed from service and the leak isolated. Two I o s t redundant charging pumps remained operable at all times. Similar events are 1 I

o s l described in 1.ERs 79-39 (U-1) and 77-75 (U-2).

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.J 34 35 36 40 42 43 44 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS h i o lleak occurred due to a oinhole crack in heat affected mno nf a socket weld on J i i l3/4" charging pump discharge relief line. The relief valve was removed and reolaced. 1

, , l Vibration of line appears to have been cause of leak. A design modification is under I

, 3 l review to install a larger pump discharge dampener and also a suction stabilizer to 1

, , iminir.ize vibration on system due to flow pulsations. (FCR 79-1004) l 80 7 8 9 s STA  % PCWER OTHERSTATUS DISCO Y OISCOVERY DESCRIPTION g lEl@ 1l 0 0 l@l NA l [Aj@l Operator Observation l A!TiviTv CO0 TENT .

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PU B L ICITY Q NRC USE ONLY ssuEo oE sCaie riON U 7910020,369 ll11IlllitilI:I y [Z_j@l NA I 68 69 80 5 i 8 9 to s A..E . OF ,RE, ARE p J. S. LaOiewski/M. J. Miernicki PHONE. (301) 234-7942/7962